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Accumulated Other Comprehensive Income (Schedule of Reclassifications out of AOCI by Component Net of Tax) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Operating revenue | [1] | $ (3,451) | $ (3,179) | $ (10,005) | $ (9,376)
Interest and related charges |  | 378 | 305 | 1,053 | 905
Other income |  | (373) | (121) | (658) | (391)
Income from operations including noncontrolling interests before income tax expense |  | (1,145) | (968) | (2,372) | (2,470)
Income tax expense |  | 262 | 272 | 485 | 683
Income tax expense |  | (10) | 10 | (24) | 35
Income from continuing operations net of tax | [2] | 30 | (15) | 71 | (56)
Income tax expense |  |  | 2 | (1) | 20
Income from continuing operations net of tax | [3] | 3 | (4) | 4 | (36)
Virginia Electric and Power Company |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Operating revenue | [4] | (2,232) | (2,154) | (5,809) | (5,732)
Interest and related charges | [4] | 130 | 128 | 388 | 373
Other income |  | (25) | (13) | (49) | (57)
Income from operations including noncontrolling interests before income tax expense |  | (651) | (732) | (1,314) | (1,797)
Income tax expense |  | 131 | 273 | 271 | 664
Income from continuing operations net of tax | [5] |  |  |  | 1
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Operating revenue | [6] | (423) | (401) | (1,408) | (1,313)
Interest and related charges | [6] | 28 | 25 | 79 | 72
Other income |  | (34) | (27) | (99) | (79)
Income from operations including noncontrolling interests before income tax expense |  | (192) | (191) | (428) | (478)
Income tax expense |  | 56 | 74 | 111 | 176
Income tax expense |  | (2) | 3 | (6) | 3
Income from continuing operations net of tax | [7] | 5 | (4) | 16 | (5)
Electric Fuel and Other Energy-Related Purchases |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Electric fuel and other energy-related purchases |  | 761 | 638 | 2,128 | 1,711
Electric Fuel and Other Energy-Related Purchases | Virginia Electric and Power Company |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Electric fuel and other energy-related purchases | [4] | 648 | 549 | 1,747 | 1,414
Deferred (gains) and losses on derivatives-hedging activities: | Amounts Reclassified From AOCI |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Income from operations including noncontrolling interests before income tax expense |  | 40 | (25) | 95 | (91)
Income tax expense |  | (10) | 10 | (24) | 35
Income from continuing operations including noncontrolling interests |  | 30 | (15) | 71 | (56)
Deferred (gains) and losses on derivatives-hedging activities: | Amounts Reclassified From AOCI | Virginia Electric and Power Company |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Income from operations before income tax expense |  |  |  |  | 1
Income from continuing operations net of tax |  |  |  |  | 1
Deferred (gains) and losses on derivatives-hedging activities: | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Income from operations including noncontrolling interests before income tax expense |  | 7 | (7) | 22 | (8)
Income tax expense |  | (2) | 3 | (6) | 3
Income from continuing operations including noncontrolling interests |  | 5 | (4) | 16 | (5)
Deferred (gains) and losses on derivatives-hedging activities: | Commodity contracts | Amounts Reclassified From AOCI |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Operating revenue |  | 26 | (32) | 55 | (114)
Purchased gas |  |  |  | 2 |
Deferred (gains) and losses on derivatives-hedging activities: | Commodity contracts | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Operating revenue |  | 3 | 2 | 8 | 4
Deferred (gains) and losses on derivatives-hedging activities: | Commodity contracts | Amounts Reclassified From AOCI | Electric Fuel and Other Energy-Related Purchases |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Electric fuel and other energy-related purchases |  |  | 1 | (8) | (1)
Deferred (gains) and losses on derivatives-hedging activities: | Interest rate contracts | Amounts Reclassified From AOCI |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Interest and related charges |  | 12 | 16 | 36 | 39
Deferred (gains) and losses on derivatives-hedging activities: | Interest rate contracts | Amounts Reclassified From AOCI | Virginia Electric and Power Company |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Interest and related charges |  |  |  |  | 1
Deferred (gains) and losses on derivatives-hedging activities: | Interest rate contracts | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Interest and related charges |  | 2 | 1 | 4 | 3
Deferred (gains) and losses on derivatives-hedging activities: | Foreign currency | Amounts Reclassified From AOCI |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Other income |  | 2 | (10) | 10 | (15)
Deferred (gains) and losses on derivatives-hedging activities: | Foreign currency | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Other income |  | 2 | (10) | 10 | (15)
Unrealized (gains) and losses on investment securities: | Amounts Reclassified From AOCI |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Realized (gain) loss on sale of securities |  | 3 | (10) | 5 | (74)
Impairment |  |  | 4 |  | 18
Income from operations including noncontrolling interests before income tax expense |  | 3 | (6) | 5 | (56)
Income tax expense |  |  | 2 | (1) | 20
Income from continuing operations including noncontrolling interests |  | 3 | (4) | 4 | (36)
Unrealized (gains) and losses on investment securities: | Amounts Reclassified From AOCI | Virginia Electric and Power Company |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Realized (gain) loss on sale of securities |  |  |  |  | (8)
Impairment |  |  |  |  | 2
Income from operations before income tax expense |  |  |  |  | (6)
Income tax expense |  |  |  |  | 2
Income from continuing operations net of tax |  |  |  |  | (4)
Amortization of prior-service costs (credits) | Amounts Reclassified From AOCI |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Other income |  | (5) | (5) | (16) | (16)
Unrecognized pension and other postretirement benefit costs: |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Unrecognized pension and other postretirement benefit costs, before tax |  | 25 | 21 | 75 | 63
Unrecognized pension and other postretirement benefit costs, income tax expense |  | (7) | (7) | (15) | (25)
Unrecognized pension and other postretirement benefit costs, net of tax |  | 18 | 14 | 60 | 38
Unrecognized pension and other postretirement benefit costs: | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Unrecognized pension and other postretirement benefit costs, before tax |  | 2 | 2 | 5 | 5
Unrecognized pension and other postretirement benefit costs, income tax expense |  |  | (1) | (1) | (2)
Unrecognized pension and other postretirement benefit costs, net of tax |  | 2 | 1 | 4 | 3
Amortization of actuarial losses | Amounts Reclassified From AOCI |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Other income |  | 30 | 26 | 91 | 79
Amortization of actuarial losses | Amounts Reclassified From AOCI | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Other income |  | $ 2 | $ 2 | $ 5 | $ 5
[1] | See Note 10 for amounts attributable to related parties.
[2] | Net of $(10) million and $10 million tax for the three months ended September 30, 2018 and 2017, respectively, and net of $(24) million and $35 million tax for the nine months ended September 30, 2018 and 2017, respectively.
[3] | Net of $— million and $2 million tax for the three months ended September 30, 2018 and 2017, respectively, and net of $(1) million and $20 million tax for the nine months ended September 30, 2018 and 2017, respectively.
[4] | See Note 18 for amounts attributable to affiliates.
[5] | Net of $— million tax for both the three and nine months ended September 30, 2018 and 2017.
[6] | See Note 18 for amounts attributable to related parties.
[7] | Net of $(2) million and $3 million tax for the three months ended September 30, 2018 and 2017, respectively, and net of $(6) million and $3 million tax for the nine months ended September 30, 2018 and 2017, respectively.

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